Introduction
If you run a KHS PET blow-molding line, you already know the headache. Uneven heating. Hot spots. Cold zones. You see it on the preforms, and you feel it in the scrap rate and the inconsistent bottle quality. We built our bulk quartz heater tubes to fix that. These aren’t off-the-shelf parts. They’re made to drop straight into KHS machines and give you one steady, predictable thermal profile.
The nitty-gritty
We spec these tubes for high-density heating—400V, 2500W. That power level is what gives you the quick response PET blow-molding cycles demand. The dimensions match KHS footprints, with a standard length around 300mm to cover the heating zone cleanly—no overhang. The 400V rating keeps current lower than a 230V option, which means less stress on your wiring and less wear on contactors. But here’s the thing: that kind of power density needs real cooling. Your machine’s blower and airflow ducting have to be able to shed the heat without letting ambient temps creep up.
What’s inside, and why it matters
The core is high-purity quartz. It handles thermal shock well and transmits infrared beautifully. Inside, a shortwave infrared element delivers fast, focused heat. A halogen gas fill helps keep the filament temperature stable, so output stays consistent over the tube’s life. And the outer quartz jacket has a reflective coating that pushes energy forward onto the preform. More of the heat goes where you need it, and less is wasted. Installation is simple, too. We use R7s connectors—double-ended, the standard for quick swaps. You can change a tube in minutes without rewiring.
What it does on the line
In KHS blow-molding, these tubes bring heat distribution back into balance across the preform neck and body. The payoff is a repeatable thermal profile, which means fewer rejects from overstretched or underheated material. Because of the R7s connection, it’s a true drop-in replacement. Downtime stays minimal, which matters when you’re running high volume. If you’re managing a busy line, this is a practical upgrade that tackles the original equipment’s heating limits—without tearing the machine apart.
A heads-up you’ll appreciate
Packing 2500W into a compact space creates serious heat. Before you switch over, make sure your cooling system can keep up. If airflow is weak, the control board and nearby components will run hotter, and that can shorten service life. Plan to check airflow when you plan the tube replacement.
Quick look: the numbers
- Power: 2500W
- Voltage: 400V
- Length: 300mm
- Connector: R7s
- Coating: Reflective quartz jacket
- For: KHS PET blow-molding machines